Final answer:
The maximum number of recessed lumineers that can be installed on a 20 amp, 277 V branch circuit, considering the safety limit to 80% capacity, is 120 lumineers.
Step-by-step explanation:
To determine the maximum number of recessed lumineers that can be installed on a 20 amp, 277 V branch circuit, we must first calculate the maximum continuous power allowed on the circuit. Safety regulations limit continuous use to 80% of the breaker's current capacity. For a 20 amp circuit, this capacity is:
20 amps × 277 volts × 0.8 (80%) = 4,432 watts
Each lumineer draws 36.8 watts at 277 volts. Therefore, the maximum number of lumineers is the total allowable power divided by the power per lumineer:
4,432 watts ÷ 36.8 watts per lumineer = 120.43
Since you cannot have a fraction of a lumineer, the maximum number of lumineers that can be installed is 120.